Power-transmitting mechanism



Feb. 12 1924.

M. MQCANN POWER TRANSMITTING MECHANISM Filed June 8, 1922 iv @v anvwtozPatented Feb. 12, 1924.

MICHAEL McCANN, or GLENMORE, NEW YORK, ASSIGNDR ro FREDERICK Perry, ACORPORATION on NEW YORK." I

OSANN COM- POWER-TRANSMITTING BEECHANISM.

Application filedlune 8,

T0 aZZ whom it may concern. 1 Be it known that I, MICHAEL MOCANN, acitizen of the United States. and resident of Glenmore, in the county ofQueens and State of New York, have invented certain new and usefulImprovements in Power-Transmitting Mechanisms, of which the following isa specification. 1

This invention relates to power transmit ting devices and has particularreference to a mechanism for transmitting power adapted for use onsewing machines.

The object ,of-the invention is to provide a simple, practical. noveland generally improved friction drive or power transmitting mechanismadapted to be secured underneath a sewing machine table-or work benchfor transmitting power from a motor to the sewing machine or othermechanism on the work bench. I 1

Another object of the. invention is to provide a power transmittingmechanism for the purpose set forth adapted to :be assembled and mountedas a single unitand provided with the necessary adjustingmeans forobtaining maximumnefliciency.

Other objectswill appear as this specifica tion proceeds while referenceis had to. the accompanying drawing in which':

Figure 1 is a front elevation of a power transmitting mechanismembodying the invention with parts omitted and parts broken away. i

Figure 2 is an end view of the mechanism looking from the left in Figure1.

' Figure 8 is a detail sectional plan view on line 3-'--?) of Figure 1with parts broken away and'parts omitted Figure 1 is a diagrammaticviewillustrating the normal. inactive positions of the driving and thedriven member in the mechanism. i W Figure 5 is a. diagrammatic: viewillustrating the driving and the driven members in operativeactivepositions.

Referring first to Figure 4-the reference 3 numeral .6 denotes a drivingmember:diagrammatically represented by the inner dotted circle, whilethe numeral 7 denotes a driven 'member represented diagrammati' cally bythe outer dotted circle. Normally these two members. are in thepositions shown, that is the drivingmember may be 1922; Serial No.566,783.

rotated. or operated continuously, while the dr1ven member remainsinoperative.

When, however, motion is to be imparted to the driven member it is movedso as to engage the driving member eccentrically as shown in Figure 5.

In the preferred arrangement described and illustrated herein, the innerdriving member may be in the form of a motor oper ated friction pulley,and the driven member may be in the formof a hollow or cup shapedwheelhaving an interior driving or friction surface adapted to engagethe driving surface of the driving pulley. And of course,-. it iswithin, the intended and legitimate scope of this invention, that theinner member may be. driven by the outer member.

It will be seen from Figure 5 that this engagement while the members arerunning together: Another advantage Is that. in

locating one member within the other, a material saving 1n space iseffected.

In the preferred embodiment of myinvention the inner driving member,consists of a a pulley 9, see Figure 3, provided with a friction band ormember '10 firmly secured to the pulley which l'atter is' carriedby andoperated 'by a suitable prime mover. as for instance the electric motorindicated at 11.

The driven member consists of the hollow or-recessed. wheel12 having aninterior surface 13 adapted to be 'frictionally and operatively engagedby the friction member Thus it is obvi- 10on the pulley'9 as is obvious.The wheel 12 is preferably integral with a two stepped belt unitcomprising the smaller and the larger belt pulleysi15 and 16respectively. A belt 17 may run over either of said pul- "leys 15 and16;

A bearing sleeve 18 is preferably integral with the wheel and pulleysaforesaid, so that the members 12. 15, 16 and 18 constitute an integraldriven unit. Saidumt is rotatably carried on a hollow shaft 15 which hasa head or disk 26 whereby said drix' ing unit is retained on the shaft.The latter is clamped in a hanger 21 by means of a screw 22 in a wellknown manner. The hanger 21 is pivoted on the adjustable pivot screws22, 22 provided with lock nuts 24;, 24:. 25 is an operating arm on saidhanger and 26 is a treadle rod for operating the hanger, the shaft andthe driven unit.

The pivot screws 22 are carried by a fixed brake yoke 27 provided with avertical base 28 and a horizontal brake arm 29. The base 28 is securedto the base lug 30 by means of a bolt and nut 31, 32. The bolt passesthrough a. slot 38 in the base lug 30 thus providing for verticaladjustment ofthe brake yoke.

In order to prevent the yoke from turning on the base lug, the yoke hasa key 34: which slides in a groove 35 in the base, see Figure 3. I

The numeral 36 denotes a brake lever which carries a brake shoe 37 ofleather or other suitable material. The brake lever isadjustably securedto the brake arm 29 by means of a bolt 38 and nut 39. The bolt passesthrough a slot 4L0 in the brake lever to permit of lateral adjustment ofthe brake shoe withrespect to the wheel 12. I In order to preventturning of the brake lever on the brake arm, the arm has a key 41 whichslides in a way 42 in the lever.

The wheel 12 is kept in contact with the brake shoe 37 by a spring 4Bwhich is seated in the yoke 27 and presses against the hanger 21 belowthe pivots 22, 22. The

spring 18 thus urges the hanger with the shaft 19 and the driven unit tothe right in Figure 2, or the spring, as stated, presses the wheel 12against the brake shoe 37.

The base lug is preferably integral with the main base 4-4: to which themotor 11 is secured. The base 14: is secured on the underside of thework bench 45. The machinery to be driven by the belt 17 is mounted ontop of the bench (not shown) and suitable provisions are of course madefor running the belt 17 upwards through the bench to drive the machinerythereon. The parts and details are not shown as they form no part of theinvention. Neither is the usual treadle mechanism illustrated forpulling the treadle rod 26 downward. An oil cup 46 of usual design forlubricating the: shaft 19 and driven unit 1216- is mounted on the end ofthe shaft. see

. Figure 1.

During the operation the motor will be lcept operating and thuscontinuously rotate the pulley 9, without, however. operating the drivenunit, because, as seen in Figures 3 and 4, the wheel 1 that is the unit,is maintained in concentric relationship with the driving pulley by thespring 43.

This positioning of the driven unit is obtained by vertical adjustmentof the hanger 27 on the base lug 30, and by adjusting the brake lever 36on the brake arm 29 as aforesaid.

hen the pulleys 15-16 are to be rotated to drive the belt 17, thetreadle rod 26 is moved downwardly, whereby the hanger 21 through theoperating arm 25 is swung downwardly and to the left in Figure 2 to movethe wheel 12 into contact with the mo tor pulley 9 and away from contactwith the brake shoe, when of course, the pulley 9 will drive the wheel12 by frictional engagement and also rotate the pulley 15-- or 16 todrive the belt which transmits the power to the machinery, a sewingmachine for instance, on the bench 45.

It Wlll'b noted that the entire mechanism may be manufactured andshipped as a unit ready to be attached to the work bench. The device iscompact, easily assembled, is very sturdy in construction and easilyadjusted. Then the operator lets go of the treadle the spring 43instantly operates to move the wheel -12into contact with the brake shoeto stop rotation of the wheel.

I claim 1. Aself contained unitary power transmitting mechanismcomprising in combination a base, a motor secured thereto, adrivingwheel operated by said motor, a driving unit adapted to beoperated by said driving wheel, a hanger for-supporting said unit, ayoke for pivotally supporting said hanger, means for adjustablysupporting'said yoke on the said base, means carried by said yoke forautomatically normally maintaining said hanger and driving unit'innon-operative relation with said driving wheel and means for operativelyengaging said driving wheel and unit.

2. A self contained unitary power transin normalnon-operativerelationship and si-' multaneously therewith maintaining said drivingunit in contact with the said brake and means for operatively engagingsaid driving unit and wheel.

3. 'A self contained unitary power'tran'smitting mechanism. including incombination a driving unit and a. driven unit, which lattercomprisesrigid supporting means, a

brake secured thereto, a hanger pivoted on said rigid supporting'means,a shaft in said" hanger," a pulley' on' said'shaft, means on said rigidsupporting means for maintaining said pulley in contact with the saidbrake means for moving said pulley away from said brake and intooperative relationship with the said driving unit and means for securingthe said driving unit to the said rigid supporting means.

4. In combination a base, a yoke adjustably mounted thereon, a brakemember adjustably mounted on said yoke, a driving unit pivoted in thelatter and provided With a pulley having an interior driving surface, amotor secured to the said base, a driving Wheel operated by said motorand adapted &

to engage the said driving surface on the pulley, a spring formaintaining the said pulley in non-operative concentric relationshipWith the said Wheel and in contact with the saidbrake member and meansfor operating said pulley into driving relationship with the said Wheel.

Signed at 245 Seventh Ave, in the county 20 of New York and State of NewYork this 2nd day of June A. D. 1922.

MICHAEL MCCANN.

